#ifndef __UDP_SERVER_HPP__
#define __UDP_SERVER_HPP__

#include<iostream>
#include"Comm.hpp"
#include"InetAddr.hpp"
#include "Dictionary.hpp"


const static int gsockfd = -1;
//const static std::string gdefaultip = "127.0.0.1";
const static uint16_t gdefaultport = 8080;

using func_t = std::function<std::string(const std::string&)>;

using namespace LogModule;

class UdpServer
{
public:
    UdpServer(func_t func, uint16_t port = gdefaultport)
    :_sockfd(gsockfd)
    , _addr(port)
    , _isrunning(false)
    ,_func(func)
    {}

    void InitServer()
    {
        //1.创建socket
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0);
        if(_sockfd<0)
        {
            LOG(LogLevel::FATAL)<<"socket:"<<strerror(errno);
            DIE(SOCKET_ERR);
        }
        //成功
        LOG(LogLevel::INFO)<<"socket succeed, sockfd :"<<_sockfd;

        // //注入网络信息
        // struct sockaddr_in local;
        // bzero(&local, sizeof(local));
        // local.sin_family = AF_INET;
        // local.sin_port = htons(_port);  //要被发到网络中
        // //local.sin_addr.s_addr = ::inet_addr(_ip.c_str()); //string ip->4bytes
        // //in_addr是一个结构体,里面唯一的成员是类型为in_addr_t的变量
        // local.sin_addr.s_addr = INADDR_ANY;


        //绑定:设置进内核里
        int n = ::bind(_sockfd, _addr.NetAddr(), _addr.NetAddrLen());
        if(n<0)
        {
            LOG(LogLevel::FATAL)<<"bind:"<<strerror(errno);
            DIE(BIND_ERR);
        }
        LOG(LogLevel::INFO)<< "bind succeed";

    }
    void Start()
    {
        _isrunning  = true;
        while(1)
        {
            char inbuffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            
            ssize_t n = ::recvfrom(_sockfd, inbuffer, sizeof(inbuffer)-1, 0, (sockaddr*)(&peer), &len);
            if(n>0){
                // //1.消息内容
                // //2.谁发的
                // // uint16_t clientport = ::ntohs(peer.sin_port);
                // // std::string clientip = ::inet_ntoa(peer.sin_addr);

                // InetAddr cli(peer);
                // inbuffer[n] = 0;
                // std::string clientinfo = cli.Ip() + ":" + std::to_string(cli.Port())+"#"
                //     +inbuffer;
                // LOG(LogLevel::DEBUG)<<clientinfo;
    
                // std::string echo_str = "echo#";
                // echo_str += inbuffer;
                inbuffer[n] = 0;
                std::string result = _func(inbuffer);
                ::sendto(_sockfd, result.c_str(), result.size(), 0, (sockaddr*)(&peer), sizeof(peer));
            }
        }
        _isrunning = false;
    }
    ~UdpServer()
    {
        if(_sockfd > gsockfd)
        {
            close(_sockfd);
        }
    }
private:
    int _sockfd;
    //uint16_t _port; //服务器的端口号
    //std::string _ip;  正常不需要ip地址
    InetAddr _addr;
    bool _isrunning;

    //业务
    func_t _func;
};



#endif